Wikipedia[1] says the patent for this expired in 2016. Interesting enough, it also mentions that Apple filed a similar patent for a "dynamically changing OLED keyboard" in 2007. I wonder if that project was abandoned or eventually morphed into the Touchbar. Personally, I think having the screen(s) be individual keys would be a huge usability improvement over the Touchbar which doesn't have the same tactile feedback.

[1] - https://en.wikipedia.org/wiki/Optimus_Maximus_keyboard